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Proceedings Paper

A comparative study of frequency offset estimations in real and complex OFDM systems using different algorithms
Author(s): Swagatika Sahu; Saumendra Mohanty; Richa Srivastav
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Paper Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is an emerging multi-carrier modulation scheme, which has been adopted for several wireless standards such as IEEE 802.11a and HiperLAN2, etc. A well-known problem of OFDM is its sensitivity to frequency offset between the transmitted and received carrier frequencies. In (OFDM) system Carrier frequency offsets (CFOs) between the transmitter and the receiver destroy the orthogonality between carriers and degrade the system performance significantly. The main problem with frequency offset is that it introduces interference among the multiplicity of carriers in the OFDM signal.The conventional algorithms given by P. Moose and Schmidl describes how carrier frequency offset of an OFDM system can be estimated using training sequences. Simulation results show that the improved carrier frequency offset estimation algorithm which uses a complex training sequence for frequency offset estimation, performs better than conventional P. Moose and Schmidl algorithm, which can effectively improve the frequency estimation accuracy and provides a wide acquisition range for the carrier frequency offset with low complexity. This paper introduces the BER comparisons of different algorithms with the Improved Algorithms for different Real and Complex modulations schemes, considering random carrier offsets . This paper also introduces the BER performances with different CFOs for different Real and Complex modulation schemes for the Improved algorithm.

Paper Details

Date Published: 28 January 2013
PDF: 10 pages
Proc. SPIE 8760, International Conference on Communication and Electronics System Design, 87601H (28 January 2013); doi: 10.1117/12.2012300
Show Author Affiliations
Swagatika Sahu, Siksha "O" Anusandhan Univ. (India)
Saumendra Mohanty, Siksha "O" Anusandhan Univ. (India)
Richa Srivastav, Siksha "O" Anusandhan Univ. (India)

Published in SPIE Proceedings Vol. 8760:
International Conference on Communication and Electronics System Design
Vijay Janyani; M. Salim; K. K. Sharma, Editor(s)

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